Remove the stems from the mushrooms. Put mushroom caps into a buttered baking dish. Set aside.

Mince bacon. Fry until crisp. Remove bacon from the grease, set aside.

Finely chop 4 mushroom stems and sauté with 1/4 of an onion, finely minced in a small amount of the bacon grease, until translucent. Add 1 finely minced clove of fresh garlic. Stir for 1 minute. Remove to cool.

Put ground beef in a bowl. Season with 2 dashes of Worcestershire sauce, salt and pepper. Add bread crumbs and the mushroom/onion sauté and stir to combine.